If your Wadia has a digital input, why would you not try it out before thinking about external dacs? The Wadia was a great-sounding machine. Yes, good-sounding dacs have come down in price, but they are not necessarily better than the big boys of 15 years ago. Wadia, ARC, Naim, Metronome and others were producing fabulous digital back then.
If you want to get a bit more recent DAC and like the Wadia gear keep an eye out for used Di 321 DAC. you can pick those up for ~$1K and they sound great. If you want DSD you have to jump up to the 322 and additional coin. or the Di 122 without the volume control implementation.
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